How to Plant Cucumbers in a Small Space
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How to plant cucumbers in a small space mostly means growing up instead of out. The RHS notes that trained cucumbers “take up little ground space,” and the pages we opened agree that a sturdy support does most of the work. Spacing, pinching and water all matter, and the sources give figures for each. This guide sets those figures side by side and marks where they differ.
Quick answer
- Grow up a support. The RHS says trained plants take up little ground space, which suits small gardens.
- Put the support in at planting time, so the tendrils have something to cling to, as the RHS advises.
- Space plants by the stated figures. The RHS gives 30 cm (1 ft) between plants in the ground, and the University of Maryland gives 12 inches within each row.
- Water at the base, keep the root zone moist, and water more often once fruit starts to form.
Pick a variety that fits the space
Variety choice comes first. The RHS says that “Small or mini cucumber varieties produce lots of fruits, which are ready to harvest more quickly than longer ones.” It also describes varieties with tiny fruits, known as gherkins, that are grown for pickling. The University of Maryland lists “dwarf-vined or bush types” among the cultivars available, and that is the group to look for on a label when vines would crowd a small bed.
The RHS also separates indoor and outdoor types. Indoor varieties suit greenhouses, polytunnels or large coldframes, while outdoor varieties are for growing “in a sunny, sheltered spot.” The same page notes that outdoor varieties are weather dependent, “starting to fruit later and finishing earlier,” so a short growing season is a limit for outdoor growers. The RHS adds that greenhouse varieties “crop for a longer season, from mid-summer through to early autumn”.
Put the support in at planting time
Vertical growing is the core of a small-space plan. The RHS says that “Growing them vertically means they take up very little ground space, which is useful in small gardens as well as small greenhouses.” It adds that “It also keeps the fruits clean and away from slugs.”
Set up the support first. The RHS says to “Put the supports in place at planting time so their tendrils have something to cling to.” It also warns that “The stems need tying in initially, and may need help later if they lose their way or come loose, especially outdoors and when carrying fruit.”
The NDSU Extension column says cucumbers are “ideal to grow on a trellis because the fruits are smaller and don’t need any extra support”. A simple setup works. The column says a trellis “can be as simple as a normal straight length of fencing”, and that you “can use whatever you have on hand” as long as it is sturdy. Outdoors, the RHS suggests a wigwam of tall bamboo canes, or stout netting on upright stakes, and it notes that cucumbers “will also climb up trellis or wires attached to a wall or fence”.
Anchoring matters as much as the design. NDSU says to anchor the trellis with stakes “inserted into the ground at least 1 foot deep”, and it advises that the trellis be “sturdy enough to support the vines and fruits”. Heavy fruit needs help as well. NDSU says that “Sometimes if the fruit is too heavy, it can slip from the vines too early”. Its fix is a sling: “Gardeners can make slings out of lightweight cloth to support the fruit until it is ripe”.
Start seedlings in pots, then plant them out
The RHS says that “Cucumbers are best sown indoors, as they can be started off earlier and will start to fruit sooner.” Its method is to fill 10 cm pots with peat-free seed compost, water well, and sow “one seed in the centre of each” at 1 to 2 cm deep. The RHS also suggests ideally positioning the seeds on their side. It notes that seedlings grown singly in small modules have “the advantage that they can be transplanted with minimal root disturbance”.
Seedlings need warmth and support before they go out. The RHS says to “Keep cucumber seedlings warm and well watered, with support to keep them upright”. It adds that they should be “moved to their final growing position after about a month, once they are growing strongly”. Protection comes first, because the RHS says to “Protect them from slugs and snails, especially in damp weather.”
Space plants for the ground, the bed or a container
In the ground, the RHS says to plant one cucumber in the centre of each prepared site, “spacing them 30cm (1ft) apart”, and then to add supports if you want to train the plants upward. The University of Maryland gives a different layout: 12 inches within the row, with 48 to 72 inches between rows, or hills of two to three plants. Its sowing note says to “Plant four to five seeds per foot, thinning to a 9- to 12-inch spacing when plants are 4- to 5-inches high”.
The two layouts are for different plans. The RHS figure is one plant per site. The Maryland figure is for row planting, and its trellis note says most cucumber types “produce long, vigorous vines” unless they are trained.
The sources do not give a plant count for a bed of a given size. Our own arithmetic on the RHS figure shows that a 3-foot row at 30 cm spacing takes about three plants, with the spacing labelled as the RHS figure and the count as ours.
Containers are the other option. The RHS says cucumbers “can also be grown in containers at least 30cm (1ft) wide and deep”. It advises that you “Position one plant in the centre, firm it in gently and water generously, then add suitable supports”. It adds that “Alternatively, plant two cucumbers in a standard-sized growing bag.” For the rest of the bed plan, see our raised bed companion planting layout post and our post on how to fill raised beds.
Pinch the growing tip and keep vines in check
Pinching keeps a small plant focused. For outdoor cucumbers, the RHS says to “pinch out the growing tip once plants have developed seven leaves, to encourage side-shoots”. It also says to “pinch out the tips of flowerless side-shoots after seven leaves”. The reason it gives is that restricting vigorous growth helps plants “concentrate on making fruit rather than growing too large”.
Trailing is the alternative to a support. The RHS notes that cucumbers can be “allowed to trail on the ground”, and if they do, a weed-suppressing membrane can help keep the fruit clean. The University of Maryland says that training vines on a trellis or fence along the edge of the garden will prevent sprawl and also “lift the fruit off the soil”. It lists benefits of trellising, including “Longer and straighter fruit”, “No soil-borne fruit rot since vines dry off faster”, and “Easier to pick and a longer harvesting period”.
Water at the base and keep moisture steady
Cucumbers need steady moisture. The RHS says they “need warmth and a steady supply of moisture to crop well.” It advises to “Take care to water at the base of the plants and try not to wet the leaves, as that can encourage fungal diseases such as powdery mildew.” It also suggests that you “Use rainwater from a butt whenever possible”, and water at cooler times of the day.
The University of Maryland gives a schedule in words. It says to “Keep the root zone moist by watering deeply and regularly during dry periods”, and to “Water more frequently when fruits begin to develop”. The RHS adds that a thick layer of mulch around the base of the plants can “help hold moisture in the ground, reduce the need for watering”, and deter weeds.
The RHS says that “When grown in containers, plants also benefit from regular feeding.” The sources do not give a feeding schedule, so follow the product label for the feed you choose.
Pollination, male flowers and harvest
Cucumber plants carry two kinds of flower. The University of Maryland says that cucumbers “have separate male and female flowers on each plant.” For a flower to set fruit, “pollen must be carried by bees” from a male flower to the female flower, the one with a tiny fruit below it.
Seed type changes what you need to do. The Maryland page describes gynoecious types as having only female flowers, and it says that “Standard seeds are added to the seed packet to ensure pollination.” Standard types produce male flowers first, with many male flowers for each female. The RHS says that for outdoor varieties, “The female flowers need to be pollinated in order to produce fruit, so don’t remove the male flowers”. The Maryland page describes parthenocarpic types as producing fruit “without pollination”, and it warns that “pollination will occur and seeds will form” if they are planted near other varieties.
Harvest size depends on the type. The University of Maryland says that “Pickling cucumbers should be 2 to 4 inches long”, and that “Slicing cucumbers should be 5 to 8 inches long depending on the variety”. Pickles and slicers come off the vine at different sizes, so check the variety before you plan the picking schedule.
How we chose
We opened three pages with curl on 2026-10-23 and kept the ones that returned HTTP 200 and readable text. They are the RHS cucumber guide, an NDSU Extension column on growing cucumbers on a trellis, and a University of Maryland Extension cucumber page. Pages that returned errors or no body text were left out.
We kept only statements that a page makes in plain words, and we checked each quoted sentence against the text of the page it came from. Where two pages give figures for the same layout, both figures appear.
What we could not verify
The three pages describe cucumbers in general. None gives a plant yield, a trellis height, or a size for a small plot. The RHS sowing dates refer to UK conditions, so this guide does not give a sowing date.
What the sources do not say
The pages do not say how many fruits one plant produces, and they do not give a trellis height for a small space. The NDSU column gives no spacing figure for trellised plants. The University of Maryland figures are for row planting, not for containers, so the container advice here comes from the RHS alone. Where the RHS and Maryland figures differ, both are shown.
Frequently asked questions
How far apart should cucumbers be planted in a small space?
The RHS gives 30 cm (1 ft) between plants in the ground. The University of Maryland gives 12 inches within each row, with 48 to 72 inches between rows, or hills of two to three plants. The sources do not give a tighter figure for compact types.
Can cucumbers grow in a container?
Yes, according to the RHS. It says cucumbers can be grown in a container at least 30 cm (1 ft) wide and deep, and that two cucumbers can go in a standard-sized growing bag. Containers also need regular feeding.
How tall should a cucumber trellis be?
The sources we opened do not give a height. They do say the trellis must be sturdy enough to carry the vines and fruit, and that its stakes should go at least 1 foot into the ground.
Do I need to remove male flowers?
It depends on the type. The University of Maryland says gynoecious types have only female flowers, and standard types produce male flowers first. The RHS says outdoor cucumbers need their male flowers, because the female flowers need pollen to make fruit, so the male flowers should stay.
How often should cucumbers be watered?
The University of Maryland says to keep the root zone moist by watering deeply and regularly during dry periods, and to water more often once fruit begins to develop. The RHS says to water at the base, avoid wetting the leaves, and water at cooler times of day.
Sources
- https://www.rhs.org.uk/vegetables/cucumbers/grow-your-own?type=v (opened 2026-10-23)
- https://www.ag.ndsu.edu/news/columns/dakota-gardener/dakota-gardener-growing-cucumbers-on-a-trellis (opened 2026-10-23)
- https://extension.umd.edu/resource/cucumbers (opened 2026-10-23)
